Thread-rolling machine.



G. T. BRENNAN.

THREAD ROLLING MACHINE. APPLIUATION FILED APR. 1o, 1914.

Patented M1525, 1914.

3 BREETBHSHEET 1.

G. T. BRENNAN.

THREAD ROLLING MACHINE.

APPLIUATION FILED APR. 1o, 1914.

Patented Aug'.25,1914.

. f TRM c. F.. N. E. /w

C. T. BRENNAN. THREAD ROLLING MACHINE.

APPLICATION FILED APR. 10, 1914.

Patented Aug. 25, 1914.

3 SHEETS-SHEET 3.

UNTTED STATES PATENT OFFICE.

CHARLES T. BRENNAN, 0F WATERCBURY, CONNECTICUT, ASSIGNUR T0 THE '.E. J'. MAN- VILLE MACHINE COMPANY, OF WATEBBURY, CONNECTICUT, A. CORPORATIUN GF CONNECTICUT.

THREAD-ROLLING MACHINE..

specification of Letters raient.

Patented Aug. 25, 1914:.

To all whom it may concern Be it known that I, CHARLES T. BRENNAN,

a citizen of the United States, residing at.

Waterbury, in the county of New Haven and State of Connecticut, have invented a new and useful Improvement in Thread- Rolling Machines, of which the following is a specification.

This invention relates to the operating mechanism of a machine of the class which has a threaded die that is stationary, a threaded die that is movable back vand forth past the stationary die, and a starter for at the proper time pushing blanks between the stationary die and the movable die so that as the latter is advanced past the former, screw threads will be rolled on the blanks.

The object of the invention is to simplify the construction of the machanism which drives the movable dic and the starter, thus reducing the cost of the machine, and facilitate the making'of and the ineness of the necessary adjustments of the operating parts for various sizes of blanks, thereby increasing the efliciency and capacity of the machine.

' Figure 1 of the accompanying drawings shows a plan of the machine. Fig. 2 shows a side elevation. Fig. 3 shows a side view of the Vmovable die, starter, and the mechanism for reciprocating these parts, the View being taken on the plane indicated by the dotted line 33 on Fig. 4. Fig. 4 shows a plan of the movable die, starter, and operating mechanism seen in Fig. 3. Fig. 5 shows on larger scale a side view of the means provided for frictionally fastening the starter connecting rod to the crank arm which drives it. Fig. 6 shows an edge view of the parts seen in Fig. 5.

The active parts of the machine are mounted on the top of any suitable form of base 1. The stationary threading die 2 is clamped in the stationary die block 3 by. a bolt et and nut 5, and it is held from lifting by `a clamp plate 6 that is bolted tothe top of the stationary die block. The stationary die block is adjusted in and out by the screws 7 which turn through a part of the frame 8. The movable die 9 is held endwise in the movable die slide 10 by a clamp 11 that is fastened by a screw 12, and is held down by the clamp plate 13. The movable die slide fits and moves in a way in the side larger gear is rotated. The rotation o of the frame and is held in position by the cap plate 14 that is bolted to the top of the frame.

A connectin rod 15 joins the rear end of the movable die slide with a crank pin 16 that projects outwardly from the side of the gear 17. Meshing with this gear is a pionion 18 fastened to the driving shaft 19 which has a driving pulley 20. Fastened to the crank pin outside of the connecting rod 15 is a crank arm 21 which is arranged to project toward the axis of the gear. Mounted on this crank arm is a stud 22, loosely hung onwhich is a block 23. The stud 22 passes through a slot 24 in the arm and-is secured in place by a nut 25. By loosening `this nut the stud upon which the block is pivoted may be moved in or out along the slot for adjusting the distance between the axis of the stud and the axis of the gear.

The starter .26 is a thin plate that is located in the space between the fixed die holder and movable die slide. This starter plate is fastened tothe starter slide 27 that moves back and forth in a yguide-way in the stationary die block. A rod 28 connects the rear end of the starter slide with the block 23 that is hung on the stud on the crank arm. This rod passes through an opening in the block and is fastened thereto against yall normal strains by the frictional thrust of two studs 29 that pass through the lower part of the block and press against the rod. These studs are forced inward to cause this pressure by a spring 30 that is held in place by and the tension of which is determined by the screw rear end of the starter slide and extending through this and turning into the stationary die block is a screw 32 on which are nuts 33 and nuts 34. The projecting rear end of the starter slide engages the nut 33 at the end of its forward movement and engages the nut 34 at the end of its backward movement. These nuts are adjusted and clamped on this screw so as to determine the exact limits vof the forward and backward movement of the starter slide.

The driving pulley ordinarily, so as to permit 'two speeds has two faces for the driving bel-t and when it is rotated and turns the driving shaft and pinion the gear through the crank pin, which projects from its face, and the connecting rod, reciprocates the movable die block carrying the movable threading die, back and forth past the .stationary threading die. The amount of movementof this die is determined, of course, by the radial distance of the center of the crank pin from the center of the gear. The rotation of the larger gear, at the same time, of course, revolves the crank arm and thus carries around the block which is hung therefrom. This, through the connecting rod, recipocates the starter slide and gives the starter a back and forward movement between the dies. With this arrangement the throw of the crank pin'is considerable and gives a long movement to the movable'die, but the throw of the block, which is carried by the crank arm much nearer the center, is littleaso that the starter has but a short movement. This movement, however, is suiiicient for it is only necessary to move the blanks from the localityr to which they are fed to a position between the dies that will cause them to be surely engaged by the movable die so as to be rolled between it and the fixed die.

The movement of the starter is determined by the adjustment of the block along the cra arm, and the exact point at which it will stop is determined by the adjustment of the'nuts on the screw which extends from the stationary die block through the rear end of the starter slide. In case any of the blanks become misplaced or jammed, so that they will not properly feed between the dies, the resistance offered causes the pusher slide connecting rod to slip back through the block and stop feeding the blanks, thus eliminating all possibility of damage to the machine from misplacement or jamming of the blanks.

The invention claimed is:

1. In athread rolling machine in combination, a stationary die holder, a movable die slide, a starter slide movable between said die holder and die slide, a driving'l gear,

a crank pin projecting from said drivmg gear, a rod connecting L,the crank pin an the movable die slide, a crank arm fastened to said crank pin, and a rod connecting said crank arm and the starter slide.v

2. In a thread rolling machine in combination, a stationary die holder, a movable die slide, a starter slide movable between said die holder and die slide, a driving gear, a crank pinprojecting from said driving gear, a rod .connecting the crank pin and movable die slide, a crank arm fastened to 80 said crank pin, a stud adjustably iconnected with said crank arm, and a rod con 'necting said stud and the starter slide.

3. In a thread rolling machine 1n combination, a stationary die holder, a movable 'die slide, a starter slide movable between said die holder and die slide, a driving gear, a .crank pm projecting from-said driving gear, a rod connectmg, the crank pm and the movable die slide, a crank arm fastened to said crank pin, a'stud adjustably connected with said crank arm, a block piv otally hung on said stud, and a rod 'connecting said block and the starter slide.

4. In a'thread rolling machine in combination, a stationary die holder, a movable die slide, a starter slide movable between said die holder and die slide, a driving gear, a crank pin projecting'from said driving gear, a rod connecting the crank pin and the movable die slide,a crank arm fastened to said crank pin, a stud adjustably connected with said crank arm, a block pivotally hung on said stud, and a rod with one 4end frictionallyconnected with said block and its other end pivotally connected with the starter slide;

5. In a thread rolling machine in combination, a stationary die holder, a movable die slide, a starter slide movable between said die holder and die slide, means extending from the stationary4 die holder for fixing the limitof movement of the starter slide, a driving gear, a crank pin projecting from said driving gear, a rod connecting the crank pin and the movable die slide,- a crank arm fastened to said crank pin, a stud adjustably connected with said crank arm, a block pivotally hung on said stud, and a rod with one end frictionally connected with said block, and its other end pivotally connected with the starter slide.

6. In a thread rolling machine in combination, a stationary die holder, a movable die slide, a starter slide movable between said die holder and die slide, a driving gear, a crank pin Iprojecting from said driving gear, a rod connecting the crank pin and the movable die slide, a crank arm fastened to said crank pin, a stud connected with said crank arm, a block pivotally hung on said stud, a. rod with one end passing through saidl block and its other end ivotally connected with `the starter s ide, studs projecting through said block and pressing against said rod, and a spring forcing said studs inwardly. c

7 In a thread rolling machine in combination, a stationary die holder, a movable die slide, a starter slide movable between said die holder and die slide, driving mechanism, a crank rotated by-A said driving mechanism, and connections between said crank and the vmovable die slide and between said crank and the starter slide.

8. In a thread rolling machine' in combination, a stationary die holder, a movable die slide, a starter slide movable between said die holder and die slide driving mechanism, a crank rotated by said driving mechanism, a fixed connection between said crank nation, a, stationary (lie holder, a movable die slicle, :1 stanter slcle movable between said die llolclez' nml flic slide, driving mechanism, a crank rotated by sacl driving' mechanism, n connection between said crank and ber movable die slide, and means connecting sai 10 crank and the starter slide, said means be* ing adjustably and fricticnally connected with said crank.

CHARLES T. BRENNAN.

Witnesses:

NATHN: R. BRONSON. DAVID JULIAN. 

